CN103295252A - Open GL (graphics library) based smoothing method and system for line segment drawing intersection point - Google Patents
Open GL (graphics library) based smoothing method and system for line segment drawing intersection point Download PDFInfo
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Abstract
An embodiment of the invention discloses an Open GL (graphics library) based smoothing method and system for a line segment drawing intersection point, and is used for solving the problem about smooth transition of the intersection of two line sub-segments in a map to obtain better map display effect and improve user experience. The method in the embodiment includes: setting up a line segment command set for drawing line segments; building point sets for drawing points; sequentially extracting two adjacent peaks in the line segment command set to draw line sub-segments according to the sequence of the peaks stored in the line segment command set and sequentially extracting one point set to draw a point at the intersection of the two line sub-segments by the radius and the circle center of the set, wherein the line segment command set comprises preset line width of the line segments and at least two sequential peaks for drawing the line segments, the point command sets comprises at least one set sequentially arranged, each point command set comprises radiuses and circle centers of the drawing points, and the radiuses of all sets are equal to the preset line width of the line segments.
Description
Technical field
The present invention relates to combination graphical display technics field, be specifically related to a kind of smoothing processing method and system of drawing intersection point based on the line segment of OpenGL.
Background technology
At present, when using OpenGL (OpenGL, Open Graphics Library) render engine to carry out the demonstration of ultrahigh resolution map in the combination system, use line segment (vector broken line) expression path usually.This line segment is linked in sequence by a lot of sub-line segments and forms, general way is the instruction set of constructing a setting-out section earlier, in order instruction set is put on each summit in the line segment, thereby render engine can connect to form sub-line segment with two adjacent summits in order successively from vertex set, all sub-sets of line segments connect to form line segment.Because line segment has certain width, just has rough transition situation at the intersection point place of two strip line segments, thereby has influenced vision, cause bad user to experience.
Summary of the invention
At above-mentioned defective, the embodiment of the invention provides a kind of smoothing processing method and system of drawing intersection point based on the line segment of OpenGL, by at the intersection point place of two sub-line segments graphical pointv, utilize the circular arc of point to make the intersection point place to seamlessly transit, reach better map display effect, improve the user and experience.
The embodiment of the invention provides a kind of line segment based on OpenGL to draw the smoothing processing method of intersection point on the one hand, comprising:
The line segment instruction set of structure draw line segments, described line segment instruction set comprise the summit of the live width that line segment is default and at least two draw line segments that sort successively;
The point instruction set of structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Order according to the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv successively.
Further, the line segment instruction set of described structure draw line segments specifically comprises:
Receive the line segment drafting instruction that user terminal sends, and draw summit and the live width of obtaining draw line segments the instruction from described line segment;
Make up the line segment instruction set of draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
Further, the some instruction set of described structure graphical pointv specifically comprises:
Be structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence be combined into set, and in order described set added in the described some instruction set.
Alternatively, also comprise the instruction of draw line segments in the described line segment instruction set.
Alternatively, also comprise the instruction of graphical pointv in described some instruction set.
The embodiment of the invention provides a kind of smoothing processing system of drawing intersection point based on the line segment of OpenGL on the other hand, comprising:
First tectonic element, for the line segment instruction set of structure draw line segments, described line segment instruction set comprises the summit of the live width that line segment is default and at least two draw line segments that sort successively;
Second tectonic element, for the some instruction set of structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Drawing unit, be used for the order according to the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, successively two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv.
Further, described first tectonic element comprises:
First receiving element is used for receiving the line segment drafting instruction that user terminal sends, and draws summit and the live width of obtaining draw line segments the instruction from described line segment;
First construction unit, for the line segment instruction set that makes up draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
Further, described second tectonic element comprises:
Second receiving element is used for receiving the point-rendering instruction that user terminal sends, and obtains the center of circle and the radius of graphical pointv from described point-rendering instruction;
Second construction unit is used for being structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence is combined into set, and in order described set is added in the described some instruction set.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages:
In the embodiment of the invention by construct in advance the line segment instruction set and the some instruction set, the summit that in the line segment instruction set, comprises the live width that line segment is default and at least two draw line segments that sort successively, comprise one group of set of ordering successively in the some instruction set, each group set comprises radius and the center of circle, and the radius of each group set is the default live width of line segment.The embodiment of the invention is extracted in the line segment instruction set adjacent two summits successively and is drawn sub-line segment, by the intersection point place at per two sub-line segments, extract one group of set in the some instruction set successively, with the set in the center of circle be the center of circle of point, with the default live width of line segment be radius at the junction of two sub-line segments graphical pointv, utilize the circular arc of institute's graphical pointv, the junction of two sub-line segments of smoothing processing, make map show and have better visual effect, improve the user and experience.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use in the embodiment of the invention below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of smoothing processing method basic flow sheet of drawing intersection point based on the line segment of OpenGL that Fig. 1 provides for the embodiment of the invention;
The structure line segment instruction set schematic flow sheet that Fig. 1-1 provides for the embodiment of the invention;
The structure point instruction set schematic flow sheet that Fig. 1-2 provides for the embodiment of the invention;
A kind of smoothing processing method basic flow sheet of drawing intersection point based on the line segment of OpenGL that Fig. 2 provides for the embodiment of the invention;
A kind of smoothing processing system basic structure synoptic diagram of drawing intersection point based on the line segment of OpenGL that Fig. 3 provides for the embodiment of the invention;
A kind of another basic structure synoptic diagram of drawing the smoothing processing system of intersection point based on the line segment of OpenGL that Fig. 3-1 provides for the embodiment of the invention;
A kind of another basic structure synoptic diagram of drawing the smoothing processing system of intersection point based on the line segment of OpenGL that Fig. 3-2 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of smoothing processing method and system of drawing intersection point based on the line segment of OpenGL, is used for the unsmooth problem of the junction of two sub-line segments of solution, and then improves the visual effect that map shows, gives the user and better experiences.
As shown in Figure 1, a kind of line segment based on OpenGL is drawn the smoothing processing method of intersection point, comprising:
The line segment instruction set of step 110, structure draw line segments, described line segment instruction set comprise the summit of the live width that line segment is default and at least two draw line segments that sort successively;
Be understandable that the combination system can be used for map and show to have very big interblock space, can adopt the smaller screen splicing, also can adopt large screen splicing; Single screen splicing one to one also can be put in order the screen splicing by a pair of MxN; Smaller screen mixes splicing greatly, also can according to the environment for use of combination system, select suitable product and connecting method according to the user to system scale and application requirements that the combination system proposes.In the combination system, adopt the OpenGL render engine to carry out map and show that adopt line segment to represent the path usually, and line segment mainly is made of a plurality of sub-line segments, each sub-line segment mainly is formed by connecting by two summits.
As a rule the OpenGL render engine carries out the line segment drafting according to the line segment instruction set of structure, and the line segment instruction set generally comprises the default live width of line segment, also has the summit of ordering successively.
Alternatively, the line segment instruction set can also comprise the how instruction of draw line segments, is used to indicate how draw line segments of OpenGL render engine.
Further, the line segment instruction set can be drawn instruction according to the line segment of user terminal and be constructed, and as Figure 1-1, above-mentioned steps 110 specifically can comprise:
The line segment that A1, reception user terminal send is drawn instruction, and obtains summit and the live width of draw line segments from described line segment drafting is instructed;
Wherein, the user terminal start-up routine is drawn instruction with relevant line segment and is sended over, and after the combination system receives and draws instruction, will draw summit and the default live width of collecting draw line segments the instruction from line segment.
The line segment instruction set of A2, structure draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
Wherein, make up a line segment and draw instruction, the summit is added in the inlet wire section instruction set in order.
For example the line segment that sends from user terminal is drawn the instruction and is got access to summit P0, P1, P2---PN, with default live width K, to make up a line segment instruction set N so, P0, P1, P2---PN are added among the inlet wire section instruction set N in order, simultaneously, default live width K is also added in the inlet wire section instruction set, obtain line segment instruction set N1{{P0, P1, P2---PN}, K}.
The point instruction set of step 120, structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Be understandable that in the combination system, when the OpenGL render engine was opened, acquiescence was not opened a smooth effect, and when drawing sub-line segment, what the junction of two sub-line segments showed is a rectangular zone.Behind the opening point smooth effect, round dot can be drawn in the junction of two sub-line segments, and puts rounded zone.
Further, the some instruction set of above-mentioned steps 120 structure graphical pointvs specifically comprises, shown in Fig. 1-2:
The point-rendering that P1, reception user terminal send instructs, and obtains the center of circle and the radius of graphical pointv from described point-rendering instruction;
P2, be structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence be combined into set, and in order described set added in the described some instruction set.
Alternatively, can also comprise the instruction of graphical pointv in described some instruction set, be used for prompting OpenGL render engine and how to draw round dot.
For example, make up a some instruction set N2, { q1, q0}, { q2, q0}, { q0} then a bit adds institute and advances an instruction set N2, obtains N2{{q1, q0}, { q2, q0}, { q3, q0}--{qN-2, q0}} for q3, q0}--{qN-2 to have point respectively.
Step 130, according to the order on the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv successively.
Be understandable that, according to the order on line segment instruction centralized stores summit, will extract adjacent two summits successively and draw sub-line segment, for example, from line segment instruction set N1{{P0, P1, P2---PN}, extract { P0 among the K}, P1}, be that live width is drawn the first sub-line segment with K, extract { P1, P2}, draw the second sub-line segment again with K, { PN-1, PN} draw last (N-1) sub-line segment, as seen until extracting, line segment mainly is made up of a plurality of sub-line segments, the line segment instruction set also can be expressed as N1{{P0, P1}, { P1, P2},---{ PN-1, PN}, K}.
Junction at two sub-line segments, the intersection point place of the corresponding first sub-line segment and the second sub-line segment in order, extract first group of set from an instruction set, the center of circle with first group of set the inside is the center of circle of point, draw first point according to the radius in the set in the junction of the first sub-line segment and the second sub-line segment, utilize the circular arc of this point, the seamlessly transitting of junction that can allow two sub-line segments, phenomenons such as unfilled corner can not occur, improve display effect.
For example, the line segment instruction set is N1{{P0, P1}, { P1, P2},---{ PN-1, PN}, K}, the point instruction set is N2{{q1, q0}, { q2, q0}, { q3, q0}--{qN-2, q0}} is so in the first sub-line segment { P0, P1} and the second sub-line segment { P1, the junction of P2}, get first some q1, q0} graphical pointv, q1 are represented the center of circle a little, q0 represents radius, the live width K of radius q0 and line segment is identical, is understandable that the live width unanimity of each sub-line segment.
Be understandable that, point is identical with the drawing principle of circle, user terminal can add the drafting function of circle in advance at the OpenGL render engine, utilize the point in the circle replacement embodiment of the invention, this shows, smoothly also belong to technical solution of the present invention by what reach sub-line segment junction two sub-line segment junction draw circles, do not limit at this.
The embodiment of the invention is mainly drawn sub-line segment by extract two adjacent vertexs successively from the line segment instruction set, at the junction of two sub-line segments graphical pointv, utilize the circular arc of point to handle two unsmooth problems in sub-line segment junction effectively, make the intersection point place seamlessly transit, improve the visual effect that map shows, bring better user to experience to the user.
To further be described in detail the embodiment of the invention below, as shown in Figure 2, a kind of line segment based on OpenGL is drawn the smoothing processing method of intersection point, can comprise:
Be understandable that, open the OpenGL render engine, carry out preliminary smooth effect setting.
The line segment that step 220, reception user terminal send is drawn instruction and point-rendering instruction, and obtains summit and the live width of draw line segments from described line segment drafting instruction, obtains the center of circle and the radius of graphical pointv from described point-rendering instruction;
Be understandable that the OpenGL render engine obtains corresponding summit and the center of circle by user terminal, and the default live width of corresponding line segment and the radius of point.
Wherein, M summit and a default live width are arranged in the line segment instruction set, M be one more than or equal to 2 positive integer.
Step 240, be structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence is combined into set, and described set is added in the described some instruction set in order, comprise N set at least in the described some instruction set, described N=M-2;
Wherein, comprise N set in the some instruction set, when having 2 summits in the line segment instruction set, can only draw a strip line segment, and not set in this time point instruction set, can be without graphical pointv.When 5 summits are arranged, can draw 4 strip line segments in the line segment instruction set, 3 junctions are arranged, in the some instruction set 3 set be arranged, a point is drawn in each set corresponding junction respectively.
Wherein, extract adjacent two summit i and j successively and draw sub-line segment, in the junction of sub-line segment, extract the set of corresponding some instruction set successively, graphical pointv reaches sub-line segment smooth transition.
The embodiment of the invention also provides a kind of smoothing processing system of drawing intersection point based on the line segment of OpenGL on the other hand, as shown in Figure 3, can comprise:
First tectonic element 310, for the line segment instruction set of structure draw line segments, described line segment instruction set comprises the summit of the live width that line segment is default and at least two draw line segments that sort successively;
Second tectonic element 320, for the some instruction set of structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Drawing unit 330, be used for the order according to the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, successively two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv.
Further, shown in Fig. 3-1, first acquiring unit 310 comprises:
First receiving element 340 is used for receiving the line segment drafting instruction that user terminal sends, and draws summit and the live width of obtaining draw line segments the instruction from described line segment;
First construction unit 350, for the line segment instruction set that makes up draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
Further, shown in Fig. 3-2, second acquisition unit 220 comprises:
Second receiving element 360 is used for receiving the point-rendering instruction that user terminal sends, and obtains the center of circle and the radius of graphical pointv from described point-rendering instruction;
Alternatively, also comprise the instruction of draw line segments in the described line segment instruction set, and the instruction that also comprises graphical pointv in described some instruction set.
In the embodiment of the invention, first tectonic element 310 receives line segment from user terminal and draws instruction, draw summit and the live width that obtains draw line segments the instruction from line segment then, make up corresponding line segment instruction set, the summit is added in the inlet wire section instruction set, simultaneously in order, second tectonic element 320 is also with corresponding line segment instruction set, make up the some instruction set of graphical pointv, comprise the set of drawing each point in the some instruction set, each set comprises the center of circle and radius.Drawing unit 330 is according to the order on the summit of line segment instruction set, extract adjacent two summits successively and draw sub-line segment, and in the junction of two sub-line segments, the difference graphical pointv, utilize the circular arc of point to avoid sub-line segment junction unfilled corner or out-of-flatness situation to occur, make the junction of sub-line segment to seamlessly transit, obtain better map display effect.
In the embodiment of the invention, by draw line segments instruction set and some instruction set, and comprise live width that line segment is default and the summit of draw line segments in the line segment instruction set, comprise a little radius and the center of circle in the some instruction set, from the line segment instruction set, extract two adjacent summits successively, draw sub-line segment according to the live width that line segment is default; In the junction of per two sub-line segments, extract the set of corresponding point, according to the center of circle and the radius graphical pointv of set, utilize the circular arc of point, make the junction of two sub-line segments to seamlessly transit, make map show and have better visual effect, improve the user and experience.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
More than a kind of line segment based on OpenGL provided by the present invention is drawn intersection point smoothing processing method and system be described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the smoothing processing method based on the line segment drafting intersection point of OpenGL is characterized in that, comprising:
The line segment instruction set of structure draw line segments, described line segment instruction set comprise the summit of the live width that line segment is default and at least two draw line segments that sort successively;
The point instruction set of structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Order according to the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv successively.
2. method according to claim 1 is characterized in that, the line segment instruction set of described structure draw line segments specifically comprises:
Receive the line segment drafting instruction that user terminal sends, and draw summit and the live width of obtaining draw line segments the instruction from described line segment;
Make up the line segment instruction set of draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
3. method according to claim 1 is characterized in that, the some instruction set of described structure graphical pointv specifically comprises:
Receive the point-rendering instruction that user terminal sends, and from described point-rendering instruction, obtain the center of circle and the radius of graphical pointv;
Be structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence be combined into set, and in order described set added in the described some instruction set.
4. according to each described method of claim 1～3, it is characterized in that, also comprise the instruction of draw line segments in the described line segment instruction set.
5. method according to claim 4 is characterized in that, also comprises the instruction of graphical pointv in described some instruction set.
6. a smoothing processing system of drawing intersection point based on the line segment of OpenGL is characterized in that, comprising:
First tectonic element, for the line segment instruction set of structure draw line segments, described line segment instruction set comprises the summit of the live width that line segment is default and at least two draw line segments that sort successively;
Second tectonic element, for the some instruction set of structure graphical pointv, described some instruction set comprises at least one group of set of ordering successively, and each group set comprises radius and the center of circle of graphical pointv, and the default live width of the radius of all set and described line segment is identical;
Drawing unit, be used for the order according to the summit of described line segment instruction centralized stores, extract in the described line segment instruction set adjacent two summits successively and draw sub-line segment, successively two sub-line segment junctions, extract one group of set of some instruction set successively, with the radius in the described set and center of circle graphical pointv.
7. system according to claim 6 is characterized in that, described first tectonic element comprises:
First receiving element is used for receiving the line segment drafting instruction that user terminal sends, and draws summit and the live width of obtaining draw line segments the instruction from described line segment;
First construction unit, for the line segment instruction set that makes up draw line segments, add in the described line segment instruction set on each summit that the described line segment that receives is drawn in the instruction in order, and live width is added in the described line segment instruction set.
8. system according to claim 6 is characterized in that, described second tectonic element comprises:
Second receiving element is used for receiving the point-rendering instruction that user terminal sends, and obtains the center of circle and the radius of graphical pointv from described point-rendering instruction;
Second construction unit is used for being structured in the some instruction set of two sub-line segment junction graphical pointvs, according to the order of connection of two sub-line segments the center of circle and the radius of the graphical pointv of correspondence is combined into set, and in order described set is added in the described some instruction set.
9. according to each described system of claim 6～8, it is characterized in that, also comprise the instruction of draw line segments in the described line segment instruction set.
10. according to each described system of claim 6～8, it is characterized in that, also comprise the instruction of graphical pointv in described some instruction set.
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| CN106033409A (en) * | 2015-03-20 | 2016-10-19 | 广州金山移动科技有限公司 | Vertex editing method and device |
| CN106033409B (en) * | 2015-03-20 | 2019-07-26 | 广州金山移动科技有限公司 | A kind of vertex edit method and device |
| CN107038729A (en) * | 2017-03-10 | 2017-08-11 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of digital meter panel method for drafting based on OpenGL ES |
| CN111696048A (en) * | 2019-03-15 | 2020-09-22 | 北京四维图新科技股份有限公司 | Smoothing method and device for wall sampling line |
| CN111696048B (en) * | 2019-03-15 | 2023-11-14 | 北京四维图新科技股份有限公司 | Smoothing processing method and device for wall sampling line |
| CN110136221A (en) * | 2019-04-12 | 2019-08-16 | 百度在线网络技术（北京）有限公司 | Preprocess method and device for figure layer drafting of navigating |
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Application publication date: 20130911 |